This year, the St-Louis Blues are celebrating their 50th anniversary season as a NHL franchise. The St-Louis Blues were part of the The National Hockey League (NHL) expansion in the 1967-68 season. Six new franchises were added to double the size of the league.The print on the back of the puck is to commemorate NHL 100th anniversary. This special edition puck comes packaged in a clear cube with an NHL 100th anniversary insert and an NHL hologram.